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I wouldn't have any real concerns about clamping down (relatively) soft wood to allow planing.
I don't know if Keter actually manufacture those clamps.
Irwin, who do manufacture a range of clamps do supply different clamping force,
cheapest, force unspecified, (150/300mm length)
medium duty, 136kg, (150-900mm)
heavy duty, 272kg, (150-900mm).
If you had a real c0ncern Toolstation stock the Irwin medium duty, (heavy are 'next day').You could relieve some of the stress on both the planer and the clamps by cutting a series of shallow cuts with a saw, (hand/powered), to remove most of the unwanted timber.
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Thos clamps are just standard quick grip clamps so fine for holding securely. Not sure if they'd be as good as a workmate for clamping something and planing the whole length as the workmate clamps are lower profile but you could always add some spacers to allow that.
It's a more stable structure and a bit heavier but doesn't have a bar at the bottom where you can put your foot to prevent wobbling. Don't really remember that being an issue when I've used it though.
Main reason I have it is that it folds up neater and fits in the cupboard under my stairs which means I actually use it as opposed to not bothering getting the workmate down from the loft and using garden furniture instead ... It's useful enough but nothing revolutionary compared to a workmate (although the quick clamps can make it a bit quicker than winding in and out).
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I got the Worx Pegasus and am really happy with it. Not cheap nor as light as i thought it might be but super sturdy with a bigger/flatter work top and packs down neatly . Clamp system and storage is well thought out and it just feels like a new design. An extra but for planing wood you might want to look into the saw horse add on as well.
@aggi or @mespilus re the workmate alternatives are the jaws and overall structure sufficient to plan wood?
In my case a c.30cm long peice of wood.
@jono84 what did you go with in the end? Sadly my dad's workmate now seems at the end of its life as I can't grip wood to plane. And unfortunately the cost of replacing the top makes repairing prohibitively expensive.